I guess attractive screenshots affect me the most, its a way to see how serious and original the game is. As they say "One image says moore than a thousand words ^^" but when it comes down to playing i look for 1: Fun, sure its great when a game is original, but a fun game that tries just a few new ideas is in my oppinion better than a ultra complex super innovative mod.

2: Visuals, interesting visuals is important for me since....well its like what makes the game special. Art styles and mapdesign is everything you see in a game, and if thats not good, well then you can **** off XD